Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ff1a152b8afddc…

MALICIOUS

PDF

169.9 KB Created: 2021-08-18 11:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: a34f93e4fa6bb2534edd268c440479fd SHA-1: d086c00707d13f00c6c16db6321b6ede30c1298b SHA-256: c3ff1a152b8afddceb69c73c24a3d7bb7e8761aee5dd4093beea7d1ab4cbb805
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple detection engines, including ClamAV and an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to host and distribute malicious content. The presence of numerous unknown URLs further supports its role as a distribution vector, likely for phishing or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886f4055ede---93671819030.pdf In PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/kopejefu.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/271aea94d0a2aab107a125390a24a50d/rejotomivivizu.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/392bc0f33a0b4330d356931e4ce099b4/88599532809.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/ponedupozotakamup.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/51671004126.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/sorobot.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/31550470961.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a56e6ec189---luborevanozenupaxabegewi.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/15784695280.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/54719756088.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/qurr4scfdjbbdmmgbf9fpbjs15/tuluzoxudujubar.pdfIn PDF document text
    • https://strechybenesov.cz/content/padugalovareborok.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/1026067197.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/wimetataw.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/27926847283.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ddc7b8d5e---wiravowonoserox.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/58695185615.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16215915181224.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/defcd93291647c79d72f67064d588d50/xarumutafetonofitunu.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081328208243---98774923178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=2003+ford+expedition+service+manual+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00023046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23046 20172 bytes
SHA-256: 5c5581a448c51e240172bf8e891038d93591bc1590d32a62a8bee6e36e47858d
font_01_sfnt_off00026495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00027cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27CAC 11368 bytes
SHA-256: 46580392a4a5f0381eabed833ed6b674bdb0651eb6af258ddc53565cf9a45933

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